object Test03 {
  def main(args: Array[String]): Unit = {
    val p = new hello()
  }
}

class student3(){
  var name:String = _
  var age:Int = _
  var address:String = _
}

class hello (var name:String = "张无忌", var age:Int = 25) {
  println("student3主构造器初始化")
}
